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Acetogenic bacteria are present in high numbers in some digestive ecosystems such as the termite gut and the human colon. Acetogens are able to use H2 and C0 2 to produce acetate but their range of substrates is wider than that of methanogens with which they are in competition for H2. Their affinity for hydrogen probably not permit them to outcompete methanogens (Cord-Ruwish et al, 1986, Arch Microbiol, 149, 350-357). Therefore, we examined the possibility of two acetogenic strains to be able to grow mixotrophically by the simultaneous use of H2/CO and carbohydrates. In contrast to use of H2/CO alone, mixotrophy could theoritically provide cells with more energy per unit time (and per mol H2 used for acetogenesis) and might ultimately contribute to a competitive advantage over methanogenesis in vivo. The two acetogenic strains Ser5 and Ser8 were isolated from the rumen of a 20h-old

Mixotrophy by rumen acetogenic bacteria in the utilization of hydrogen and sugars